<template>
    <div class="topnav">
      <router-link to="/" class="logo">
        <svg class="icon">
          <use xlink:href="#icon-tree"></use>
        </svg>
      </router-link>
      <ul class="menu">
        <li>
          <router-link to="/doc">文档首页</router-link>
        </li>
      </ul>
      <svg v-if="toggleMenuButtonVisible"
          class="toggleAside"  @click="toggleMenu">
        <use xlink:href="#icon-menu"></use>
      </svg>
    </div>
</template>
<script lang="ts">
import {inject, Ref} from 'vue'
export default {
  props: {
    toggleMenuButtonVisible: {
      type: Boolean,
      default: false
    }
  },
  setup(){
    const menuVisible = inject<Ref<boolean>>('menuVisible') // 可以理解为 get
    const toggleMenu = ()=>{
      menuVisible.value = !menuVisible.value
    }
    return {toggleMenu}
  }
}
</script>
<style lang="scss" scoped>
.topnav {
  display: flex;
  padding: 16px;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 20;
  justify-content: center;
  align-items: center;
  > .logo {
    max-width: 6em;
    margin-right: auto;
    > svg {
      width: 24px;
      height: 24px;
    }
  }
  > .menu {
    display: flex;
    white-space: nowrap;
    flex-wrap: nowrap;
    > li {
      margin: 0 1em;
    }
  }
  > .toggleAside {
    border: 3px solid white;
    width: 32px;
    height: 32px;
   position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    display: none;
  }
  @media (max-width:500px){
    > .menu{display: none;}
    > .logo{margin: 0 auto;}
    > .toggleAside{display: inline-block;}
  }
}
</style>